Davit for boats



.(No Model.)

'G. P. LAWLEY.

DAVIT FOR BOATS.

Ail a dilhl UNITED STATES GEORGE F. LA\VLEY, OF BOSTON, lllASSACHUSE'FS.

DAVIT FOR BOATS.

SPECIFICATION forming part of Letters Patent- 1To. 446,357, datedFebruary 10, 1891.

Application filed October 6, 1890. Serial No. 367,266. (No model.)

To all whom, it nuty concern.-

Be it known that I, GEORGE F. LAWLEY, a citizen of the United States,residing at Bostou,in the county of Suffolk and State of Massachusetts,have invented certain Improvements in Davits for Boats, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, making part of this specification, inwhich-- Figure l is a side elevation of aboat-davit constructed inaccordance with my invention. Fig. 2 is a vertical section (enlarged)through the lower portion of the same. Fig. 3 is a front elevation ofthe portion represented in Fig. 2. Figs. 4 and 5 are enlargedperspective views of two portions or members of the rule-joint separatedfrom each other.

My invention relates to boat-davits in which the davit-arm is providedat its lower end with a hinge-joint, so that it can be swung inward oroutward, as may be required; and my invention has forits object toimprove the construction of davits of this description,

whereby the joint at the bottom of the davitarm, together with the stopsfor limiting its movement in either direction, are rendered stronger andmore capable of resisting the strain to which they are subjected whenthe boat is swung over in either direction.

To this end my invention consists in a davitarm hinged to its support orbase by means of a rule-joint of novel construction provided withshoulders or stops on each side for limiting the movement of thedavit-arm in either direction, as hereinafter set forth.

In the said drawings, A represents the deck of a vessel, and B the rail,through which passes in the usual manner the vertical bolt 0, whichsupports the davit-arm D, the lower end of the bolt (1 fitting into asocket in the water-way or plank-shearof the vessel. The davit-arm D ishinged to the upper end of the supporting-bolt O by means ofarule-jointE, one portion or member of which is formed by cutting anopen slot 1) in the lower enlarged end of the davit-arm D, and the otherportion or member by forming a tongue d on the upper end of the enlargedend of the bolt 0, the two being connected by a pivot-pin e. The lowerends of the cheeks f at the lower end of the davit-arm are curved in thearc of a circle and .fit into correspondingly-curved I recesses g,formed on opposite sides of the upper end of the bolt (1, the outersurfaces of the cheeks and the sides of the bolt 0 being flush, as seenin Fig.

On each side of the tongue d is' formed a solid shoulder h of the entirewidth of the bolt 0, against which strike the corresponding shoulders2', formed on each side of the cheeks f of the davit-arm when the latteris swung over to either side on the pivot-pin e, thuslimiting itsmovement in either direction, as desired. The davitarms D, which arecurved outward, as usual, and provided with the ordinary tackle, canthus be swung outboard on their joints E to carry the boatinto aposition over the water, so that it can be raised orlowered withoutcominginto contact with the side of the vessel, and when the boat israised into the position seen in Fig. 1 the davit-arms can be swunginward to bring the boat over the deck, if desired. When in either ofthese two positions the davit-arm will be held in place by the weight ofthe boat, but is preferably locked by means of a pin k, which passesthrough a hole in both cheeks ff and lies on one side or the other of anextension 71 of the tongue d, thus preventing the davit-arm from beingmoved until the pin 70 has been withdrawn. The tongue (1 is providedwith a central hole 19, through which the pin is is passed'when it isdesired to hold the davit-arm in an intermediate position, as shown indotted lines in Fig. 1.

It will be obvious that the construction of the lower shoulders h of theabove-described rnle-joint is such that a solid bearing will bepresented to resist and support-the Weight of the boat, which thusproduces a direct downward pressure upon said shoulders, which cannotconsequently become broken or injured by the strainer pressure to whichthey are subjected. t

I am aware that a davit-arm has been hinged to its support within asocket consisting oftwo parallel plates provided at their inner andouter corners with projections which serve as stops for limiting theswinging movement of the arm in either direction; but in practiceit isfound that these projections or stops soon become bent or broken by theconstant contact therewith of the shoulders on the davit arm as thelatter is swung over with the boat from side to side.

My invention differs from this in presenting a much stronger and moredurable joint having solid shoulders on each side so constructed thatthe weight or pressure will be exerted thereon in a downward instead ofav lateral direction, thereby enabling my improved joint to successfullyresist any possible strain Which may be brought upon it.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is

1. In a boat-davit, a davit-arm hinged=to its supporting bolt or base bymeans of a rulejoint E, the members of which are provided 1 on the innerand outer sides with shoulders h 1', the lower shoulders h being adaptedto receive a direct downward pressure produced by the Weight of thesuspended boat, substantially as described.

in the cheeksff and engage the extension 72 v of the tongued to lock thedavit-arm in place, substantially as set forth.

Vitness my hand this 2d day of October, A. 1). 1890.

GEORGE F. LAWLEY. In presence of P. E. TEsoHEMAcHER, HARRY W. AIKEN.

